Control System Design for 3×3 Processes Based on Effective Transfer Function and Fractional Order Filter
G. Hemanth Krishna1, R. Kiranmayi2, M. Rathaiah3

1G. Hemanth Krishna, PG Student, Department of EEE, JNTUA, Anantapur (Tamil Nadu), India.
2R. Kiranmayi, Professor, Department of EEE, JNTUA, Anantapur (Tamil Nadu), India.
3M. Rathaiah, Assistant Professor, (Ad-hoc), Department of EEE, JNTUA, Anantapur (Tamil Nadu), India.
Manuscript received on 20 August 2019 | Revised Manuscript received on 11 September 2019 | Manuscript Published on 17 September 2019 | PP: 1261-1266 | Volume-8 Issue-2S8 August 2019 | Retrieval Number: B10500882S819/2019©BEIESP | DOI: 10.35940/ijrte.B1050.0882S819
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Abstract: Designing of PI/PID controller with fractional order set point filter is proposed to achieve the improved performance of 3×3 processes. But the design of controller for such higher dimensional multivariable processes is too difficult task because of interaction involved between the process variables. So interaction must be taken into design consideration. In this method of design determines the interaction between the variables using RGA and RNGA methods and uses it in converting the multivariable processes into multiple single loops. The interaction problems between the loops are overcome by incorporating the decouplers in the control loops. Then, the Effective Transfer Function (ETF) has obtained to design PI/PID controller for each individual element as in single input processes. The fractional order filter is also added to improve the servo response of the processes. Hence, the proposed system improves the overall performance by minimizing the interaction effects due to set point variations. This method is also validate by using a case study.
Keywords: Interactive Process, Relative Gain Array, Effective Open Loop Process, Multivariable Processes, Fractional Order Filter, Decoupler.
Scope of the Article: Low-power design